[PD] [Gem]: basic questions

[Roman Haefeli]

On Sun, 2007-11-11 at 15:55 -0500, marius schebella wrote:
> hi,
> I will try to answer from my understanding, and then maybe iohannes and 
> chris can correct me.
> usually when you turn gem rendering on, the following happens:
> erase the buffer, draw all objects according to the order of gemheads 
> (every gemhead can have a sorting number 0-100 and negative values.)
> I am not sure if this is buffer 2,

according to output of [gemwin] on console, when sent a 'print' message,
the default (standard) mode is 'buffer 2'. 

>  but it is definitely not buffer 1.
> buffer 1 means: erase the buffer only when gemwin gets a bang. and draw 
> only when a gemheads gets a bang.
> there is an example 04.pix/10.pixdatasimple that makes use of that 
> technique.

ah, thanks for this hint. i think i got it now. it probably would be
cool to have a reference from gemwin-help.pd to this patch. i didn't
have an idea where to look for an example, that uses single buffer mode.
the most obvious place to look for it was for me gemwin-help.pd, but it
only tells you, that there are these two modes, but not how to use them.

> one very important object is gemframebuffer. it is not documented (no 
> help patch) and is only used in one example 07.texture/10.framebuffer 
> but it very very essential. because it enables you to render to a 
> texture on the gpu and then use this imagedata as a texture for other 
> objects.

cool. this would have been my next question :-)

yo, your words have been really helpful for me. thanks a lot.

roman


> [gemhead]
>   |
> [gemframebuffer]
>   |          |
>   |          [ID\ !!!
>   |
> [translateXYZ 0 0 -4]
>   |
> [pix_image]
>   |
> [do_your_stuff]
>   |
> [pix_texture]
>   |
> [square 4]
> 
> ------
> 
> [gemhead]
>   |
>   |   [ID\
>   |    |
> [texture]
>   |
> [square]
> 
> marius.
> 
> Roman Haefeli wrote:
> > hi all
> > 
> > the ongoing thread about using gpu to process audio made me realize,
> > that there are some basic concepts in gem, that i still don't
> > understand.
> > 
> > what is single buffer mode? what is double buffer mode? how are both
> > used? which is the default mode, that assumingly almost everyone uses,
> > when doing 'common' gem patches? 
> > 
> > is it possible somehow to render a frame on arbitrary times? the way i
> > used to use gem yet was that i told [gemwin] with wich framerate to
> > render. is there a mode or a way, where i can tell gem 'render now' and
> > then i get an updated screen, that persists until i do again 'render
> > now'?
> > 
> > are these questions somehow related to each other?
> > 
> > roman
> > 
> > 
> > 
> > 
> > 		
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> 


		
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